Cool, really like the format. (obviously) If I might suggest a layout type, I would look at one rock set to the 1/4 point right, a larger set to the 2/3 point left. With the spread on this tank, a negative space near the middle might be sweet. I just subtracted a little hardscape on mine and the negative space does wonders for the look.
I didn't see the filtration set up in the initial posts (maybe I overlooked them), but I like a fairly powerful system with this tank, as dead spots can be very likely given the dimensions. It is a long run from one side to the other, for as little volume as the tank has.